From Manual Bypass Q2 To Normal Function Vfi - GE 8 Series Operating Manual

8.2.3 From Manual Bypass Q2 to normal function VFI

NOTE !
UPS Parallel System has been turned OFF following the "Maintenance shutdown (Load
on Q2)" procedure and the load is still powered by all manual bypass Q2.
The load must be transferred back to the UPS Parallel System.
Open the front door on all UPS units and make sure that:
The safety screens are fixed in their position.
•
The switches Q1 and Q4 are open (Pos. O), and the battery fuses F8 – F9 are disconnected.
•
The switch Q2 must be closed (Pos. I).
LED Alarm is lit.
•
The synoptic diagram, on all UPS units, must display the
status "LOAD SUPPLIED BY MANUAL BYPASS Q2".
1. If not already supplied (separate mains inputs), switch-ON the mains power to the rectifier
input on all UPS units.
2. Close the input rectifier switch Q4 (Pos. I) on all UPS units.
LED 1 (input mains rectifier) must be lit and LED 3 (rectifier) must blink.
The rectifier starts up automatically, supplying the DC circuit, and charging the DC capacitors.
The LED 3 (rectifier) stops blinking and stays ON, indicating that the DC link has reached the floating voltage.
3. Battery coupling to DC link on all UPS units.
After awhile, the green LED LD1 next to the battery fuse carrier, F8 – F9 lights up, indicating the rectifier
supplies the floating voltage.
After checking the right polarity, connect the battery to the DC-link by closing F8 – F9.
The battery is now connected to the DC link. LED 4b (charging battery) should be lit indicating battery charge.
4. Close the output switch Q1 (Pos. I) on all UPS units.
When the last Q1 will be closed the output will be supplied parallel from automatic bypass and manual
bypass Q2 of all UPS units.
Attention: before executing next procedure 5 ensure that:
The synoptic diagram, on all UPS units, must display the
status "LOAD SUPPLIED BY AUTOMATIC BYPASS AND
MANUAL BYPASS Q2".
Modifications reserved
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